Abstract
AbstractTo improve the performances of surface acoustic wave (SAW) device, the architecture of dual track SAW device was proposed in this paper. The dual track architecture and the multistripe couplers (MSCs) were skillfully applied to the dual track SAW device. The bulk acoustic wave (BAW) excited by input IDT was separated and eliminated by the full transfer MSC. The bidirectional SAW launched by input interdigital transducer (IDT) can be totally received by two output IDTs connected in parallel. The triple transit echo signals were suppressed by dual track in input IDT. Furthermore, the dummy electrodes were used as eliminate the phase front distortion of waves propagating through apodized IDTs, and split electrodes were used as minimize acoustic reflections within transducers. By means of a dual track SAW device with center frequency at 203.559 MHz, the results of test and analysis are presented. Experiments results confirm that the dual track SAW device has good response characteristics in frequency domain and time domain, and the passband ripples and the side lobes are acceptable and better than ones of traditional SAW device.KeywordsSurface acoustic wave (SAW) deviceDual trackBulk acoustic wave (BAW)triple transit echo signals
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